The　availability　of　the　unified　estimation　method　for　use　with　Slide　Gate　Plate　was　confirmed　through　our　experiment； the　fast　fracture　tests　and　the　cyclic　fatigue　tests　were　carried　out　at　room　temperature　and　1400℃　in　an　argon　gas　atmosphere．Only　the　fast　fracture　test　was　conducted　　at　1100℃，1200℃　and　1300℃　in　this　argon　gas　atmosphere．The　following　results　were　obtained． （1）The　unified　estimation　method　was　shown　to　be　applicable　for　the　strength　evaluation　of　the　complex　material　composition　of　a　Slide　Gate　Plate． （2）The　temperature　dependency　of　bending　strength　was　observed　at　four　temperatures　from　room 　temperature　through　1400℃．Bending　strength　decreased　above 1300℃．

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